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. E. P. HOWE. PROCESS OF FORMING TRUE SHARP CORNERS 0N METAL SHAPES.

No. 499,022 Patented June 6, 1893.

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ms scams Pt'fizns m. motaunia, \msmmrou n c UNITED STATES PATENT OFFICE.

FRANK P. HOWE, OF DANVILLE, PENNSYLVANIA, ASSIGNOR TO THE NORTH BRANCH STEEL COMPANY, OF SAME PLACE.

PROCESS OF FORMING TRUE SHARP CORNERS ON METAL SHAPES.

SPECIFICATION formingpart of, Letters Patent No. 499,022, dated June 6, 1893. Application filed October 19. 1889- Serial No. 327,521. (No specimens.)

To all whom it may concern.-

Be it known that I, FRANK P. HOWE, a citizen of the United States, and a resident of Danville, Montour county, Pennsylvania, have invented a Process of Forming True Sharp Corners on Metal Shapes, of which the following is a specification.

The object of my invention is to provide a sharp square corner on those portions of metal shapes where a sharp corner is required, and where because of the character of the shape it is desirable or necessary that the corner required to be square should come at the parting of the rolls forming it. To illustrate how this object is attained, I will describe the operation as applied to slot rails for cable railway use, reference being had to the accompanying drawings, in which Figure 1, is a View of a portion of a rolling mill train showing the slot iron in one of the passes, being the first step in the process. Fig. 2, is a perspective diagram illustrating the second step in the process; and Fig. 3, is a transverse sectional view showing two slot irons in position.

Slot irons, (sometimes called slot rails or slot beams) used in connection with cable conduits for street railways should have a sharp right angled corner a, but owing to the peculiar shape of some slot irons it is impossible to roll' the beams with a sharp square corner. As a consequence they are rolled with a corner a rounding to a greater or less degree. This rounded corner is objectionable as it makes the mouth of the slot wider than the rest of the slot, and on this accountthe oalks of horses shoes and narrow carriage wheels are more liable to catch in the slot. By having a sharp square corner the mouth of the slot is the same width as the rest of the slot, and the danger of the horses shoes or wagon tire to be caught therein is diminished.

. Referring to the drawings, I have shown a common form of slot iron, having a head A, Web 13, and foot D. One of the finishing passes for rolling this slot is clearly shown in Fig. 1.

The iron is rolled with a rib 1) formed on the corner a, the rolls being'so cut or adjusted as to form this rib during the rolling of the slot iron. The rib is removed as shown in Fig. 2, byplaning or cutting, so that the corner a of the slot iron is perfectly sharp and true, as

shown in Fig. 3.

I claim as my invention- As an improvement in the manufacture of rolled metal beams or rails, the process consisting in first rolling the beam or rail with a projecting fin or rim,and -then cutting away the said fin or rim, whereby a true sharp corner is formed on said beam or rail, substantially as specified. y

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. FRANK P. HOWE. Witnesses: L. K. RISHEL, J. D. HOWERY. 

